Highly available Drupal on a Raspberry Pi cluster

May 25, 20163 likes4,594 views

Question: Can you run a Fortune 500 Drupal 8 website from your basement, on a cluster of Raspberry Pi computers? Answer: See this presentation to find out! Jeff Geerling is the author of Ansible for DevOps and a Technical Architect at Acquia, who has worked on many large and small scale Drupal websites.

Highly Available Drupal
on a Raspberry Pi Cluster
Jeff Geerling, php[tek] 2016
(geerlingguy)
http://www.shockinglydelicious.com/dorothys-fresh-raspberry-pie-recipe/

http://www.shockinglydelicious.com/dorothys-fresh-raspberry-pie-recipe/

The Big Question
Can you run a Fortune 500
website in your basement?

Gateway 2000 486 PC, RedHat Linux 6
1999

Highly available Drupal on a Raspberry Pi cluster

Problems with one Pi
• No redundancy
• microSD card reliability

Problems with one Pi
• No redundancy
• microSD card reliability
• No database backup

Problems with one Pi
• No redundancy
• microSD card reliability
• No database backup
• Limited resources

• No redundancy
• microSD card reliability
• No database backup
• Limited resources
High Availability
Single Pi Multi Pi

• Easy redundancy• No redundancy
• microSD card reliability
• No database backup
• Limited resources
High Availability
Single Pi Multi Pi

• Easy redundancy
• Can hot-swap a Pi
• No redundancy
• microSD card reliability
• No database backup
• Limited resources
High Availability
Single Pi Multi Pi

• Easy redundancy
• Can hot-swap a Pi
• Hot database backup
• No redundancy
• microSD card reliability
• No database backup
• Limited resources
High Availability
Single Pi Multi Pi

• Easy redundancy
• Can hot-swap a Pi
• Hot database backup
• Each server optimized
• No redundancy
• microSD card reliability
• No database backup
• Limited resources
High Availability
Single Pi Multi Pi

CPU 20 cores / 6 GHz
RAM 5 GB
Storage 80 GB microSD
Network 10/100 over Gig
www.pidramble.com
Raspberry Pi Cluster

Problem
How do you wrangle all these Pis?

“Conﬁguration management for humans.”
___________
< And cows! >
-----------
^__^
(oo)_______
(__) )/
||----w |
|| ||

Benchmarks
Benchmark Standard
Uptime 99.95%
Max page loads/sec 1000
Power Consumption 0.5 Gﬂops/watt

Benchmarks - Uptime
(as measured by Server Check.in)

Benchmarks - Performance
Nginx, Cached Page 3160 req/s
Drupal, Cached Page 34 req/s
Drupal, Uncached Page 12 req/s
For comparison:
• My MacBook Air: 6x faster
• DigitalOcean droplets: 10x faster

Benchmarks - Power
Raspberry Pi 3 260 mA
Raspberry Pi 2 220 mA
Raspberry Pi Zero 80 mA
(power draw at idle)

Benchmarks - Power
Raspberry Pi 2 0.15 Gﬂops/watt
For comparison:
• Core i7: 0.5 Gﬂops/watt
Source: http://www.phoronix.com/scan.php?page=article&item=raspberry-pi-burst&num=3

Lessons Learned
Test one change at a time. 
Rinse and repeat.

Lessons Learned
Networks are always reliable.

Lessons Learned
Networks are always reliable.
NEVER!

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